An antifungal nasal spray is prescribed for topical treatment of infections in the nasal passages and sinuses. Fungal infections can lead to chronic sinusitis with nasal congestion, runny nose, and difficulty breathing.  Individuals with compromised immune systems are more susceptible to fungal infections that can progress to a serious condition. Those who have had to live in environments with mold sometimes develop biotoxin illness, which can require multiple treatment methods…